package 第二周;

public class PI {

    public static void main(String[] args) {
        double PI=3.14;
        System.out.println("半径为1.2圆的周长为"+1.2*PI*10);
        System.out.println("半径为2.5圆的周长为"+2.5*PI*10);
        System.out.println("半径为6圆的周长为"+6*PI*10);
    }
}

